Pain and bad breath from a previously treated tooth usually indicate infection or leakage under the crown. Temporary cement can loosen over time, allowing bacteria and food to get trapped.
If left untreated, the infection can damage the tooth, surrounding bone, or gums, so it should not be ignored.
Next Steps
Get the crown removed and area cleaned
• X-ray to check root canal status
• Re-cementing or replacing the crown, or further treatment if needed
Early treatment can prevent serious damage. Please consult your dentist at the earliest.